SABRE-LL-I datasheet(73/141 Pages) STMICROELECTRONICS

73 / 141 page

SABRE-LL-I

Power bridges

73/141

Vuvhys

Under voltage

hysteresis

taux_uv

Under voltage

deglitch filter

5µs

Ilimit

Current limit

protection

3.1

5.3

tdeglitch

Current limit deglitch

time

tI_lim

Current limit response

time

In normal operating

mode (no UV)(5)

700

tI_limUV

Current limit response

time in UV condition.

When in Under

Voltage(6)

500

Switching output rise

time

VSupply = 36V, Resistive

load to gnd = 422

Ω(7)

530

Switching output fall

time

VSupply = 36V, Resistive

load to gnd = 10

Ω(6)

tdead

Crossover dead time

100

FregPwm

Operating frequency

Fosc/64

kHz

The external components connected to the pin must be chosen to avoid that the voltage exceeds this

operative range.

The regulated voltage can be calculated using the formula: VMAIN_SW = VFBREF *(Ra+Rb)/Rb.

The choice of proper values for L and C depends from the application.

Undervoltage rising and falling thresholds are intended as a percentage of feedback pin voltage

(VSW_main_FB).

This condition is intended to simulate an extra current on output.

This condition is intended to simulate a short circuit on output.

Rise time is measured between 10% and 90% of supply voltage.

Table 50.

Battery charger operating specification (continued)

Parameter

Description

Test condition

Min

Typ

Max

Unit

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